System for improved return path performance for digital communication signals using a sampled RF word interface to headend demodulators
First Claim
1. A method to recover a return path signal represented entirely as ones and zeros in a cable television system comprising the steps of:
- receiving a serial stream of digital words with appropriate synchronization information to identify the boundaries between words and to recover timing of the bits themselves;
deserializing the serial stream of digital words and synchronization information;
processing the deserialized digital words to interface digitally to an application receiver; and
forwarding the processed parallel digital words to the application receiver.
1 Assignment
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Accused Products
Abstract
An HFC return path system for digital communication signals using a sampled RF word interface to headend demodulators, provides higher performance equipment at an equivalent or lower cost and more flexible and efficient interfacing and traffic multiplexing. The return path signal from the fiber optic node to the headend/hub is represented ones and zeroes, and the digital return receiver at the headend/hub includes an optical receiver for receiving the serial stream of optical ones and zeroes and converting the optical digital signal to an electrical digital signal, a deserializer for deserializing the serial stream of digital words and synchronization information into parallel digital words, a digital filter for processing the deserialized digital words to interface digitally to an application receiver and a digital interface for interfacing and forwarding the processed parallel digital words to the application receiver.
6 Citations
22 Claims
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1. A method to recover a return path signal represented entirely as ones and zeros in a cable television system comprising the steps of:
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receiving a serial stream of digital words with appropriate synchronization information to identify the boundaries between words and to recover timing of the bits themselves;
deserializing the serial stream of digital words and synchronization information;
processing the deserialized digital words to interface digitally to an application receiver; and
forwarding the processed parallel digital words to the application receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for a recovering a return path signal of digital words, in a hybrid fiber-coax cable television system using baseband serial optical transport, in which the return path signal from the fiber optic node to the headend/hub is represented by encoding it entirely as ones and zeroes, the system including a digital return receiver and a plurality of application receivers, the digital return receiver of the system comprising:
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conversion/receiving means for receiving a serial stream of optical ones and zeroes from an optical fiber and converting the optical digital signal to an electrical digital signal;
means for deserializing the serial stream of digital words and synchronization information;
digital processing means for processing the deserialized digital words to interface digitally to an application receiver; and
interface means for interfacing and forwarding the processed parallel digital words to at least one of the plurality of application receivers. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification